Process of making stable cyanamid fertilizers.



' samurai. rna'cocx, or .onIc'AGo, 'ILZINOIS, ass'reuon TO mnmc'aii:cYAuAmD soon PANY, or BALT MORE, uamrnnnn, a conro narron or name.

'rnocns's on MAKING s m ca amaran) rnn'rrtrznns Io Drawing.

To all whom comm:

citizen of the UnitedStat'es, residing Stable Cyanamid F ertilizrs;

'. and exact description of theinvention, such same. This inventionrelates to a process of slakas will enable others skilled which it ingthe" caustic' lime in calc1um;cyanamid,

and has for its obj ect' to produce a fertilizer of this naturecontaining" substantially no caustic lime, and loss of mtrogen.

without any substantial To'these ends the invention consists in thenovel steps constituting my process more fully vhereinafter describedand particularly pointed out in the claims.

Calcium cyanamid as manufacturedcontains from- 15- to per cent. causticlime (CaO) and this limemustb'e' hydrated before packing into sacks formarket, for 'ifit-' is not hydrated, it will gradually absorb water andincreasenotionly'in Weight, but

also-in volume. Such increase not only deisa'cks) but .alsoby stroys thecontainers used (usuallyTburlap increasing in weight it lessens theproportion of nitrogen to the total weight, thuscausingcommercialannoyances of various kinds, as well as more or lesscommercial disadvantages. The simple remedy for this problem is to byrate the caustic lime by adding water during the process "ofmanufacture.-. Todo this, h'ow-. v eli fr, as'a manufacturing. process,it involves t ,e direct use of sufiicient water to hydrate the causticlime and to efiect such hydra tion in (a period of time sufl icientlyshort to produce an economical manufacturing proc- ,ess, there'arises an insuperable difiiculty which is wholly'confined to the veryhigh heat of hydration of caustic lime. In other WOI'LClS, the heatgenerated by the reaction is fountl to be suflicient to raise thecyanamid being treated toa temperature considerably above the boilingpoint of water, and at such temperature not only is some of the cyanamidnitrogen actually driven off andlost, but its form is materially.changed;

and these latter conditions, that arise are Chicago, in the courity ofCook and State of Illinois, have-invented certain new and use-' fulImprovements in Processes of Making- -andI do here- I by declarethefollowing to be a full, clear,-

in the art to 'I employ the following procedure I appertains to make anduse the.

theraw cyanamid in a finely pulver U dition, with from about 30 to 5 0peracentl of quired by the claims.-

alsoyery-undesirable' to the manufacture of -Be it known that I, SAMU'ELPEAoooma seamstre smat -Pate1ited Aug. 23,191o;.; -Application filedFebruary aris ng Sria1No.,545;16d i various forms of fertilizercompounds -in" I which cyanamid must be used.

Therefore, in can in out my process, in

order tovt'horoughly' y' rate the'caustic lime avoid the hightemperaturewhich mustacco'mpanythis hydrationwhen water'is useg l;

its Weight of ground nitrate of sodai After' ture in 'suflicieht totaland the partial solution of t'he'sodiuni ni.-'

trate proceed simultaneously. ButtheJ-solution of nitrate of soda inWater is accom-' pani'ed by .a well known-cooling effect, and:

thoroughly mixing these twosubst-ances to- -gether, water-is graduallyadded to-themixquantity to hydrate Ianamid. The partial hydration of thelime.

therefore I properly proportion. the nitrate amid is sufliciently takenup by the heat ab;

' of soda to the cyanamid, sdthattheheatof 1 hydration. of thecaus'tielimeof the cyansorp t'ion of' the nitrate of soda solution toprevent the temperature arising sufiiciently other detrinientalresultsrv In practice I do not find that any 'substantialloss of nitrogenoccursbelow '55 degrees centigrade. It f0 lows that by thistreat 'nent Iam enabled-to hydrate the caustic lime of the cyanamid in aaminimum'oftime without attaining such temperatures as are injurious to orinimicalf to the. cyanamid, or tothe materials com.

high to canse'loss of cyanami'd nitrogen or I bined with. thecyan'amidin making com mercial fertilizers and other. products. f Itisobvious'thatany otherheat absorbing'or cooling solution that will notbe. injurious-to"the fertilizer or other .produgts prefer. sodiunrFertihzer value and may be employed; althou h I nitrate on accountvof tspound may be added to the cyanamid either also on account of itscheapness, audit is also evident that the heat absorb1ngco1n-' duringthe'process of mam-facture of the cyanam1d, or at. any other t1me,and':thcre'- In my copending' application No.

' fore I do not wish to. be limited to the above 1 of even dateherewith.forfertilizers, I have I claimed the article produced by this.process and therefore make no claim thereto per se 1 saith fertilizersaeompound which upon smg water to'themixture in an amount sufiiherein.

What I claim is:-'- 1. The process of slaking the lime carriedby-fe'rtilizers; which consists in mixing with lution in water absorbsheat andthen '-add= ing with saidcyanamid a sufiicient quantity ofanitrogen compound which upon solution in water will absorb heat in orderto prevent substantially as described.

the temperature of the cyanamid rising to an injurious extent when wateris "later.

added thereto; and in adding suffic'ient water to said mixture to slakethe said lime, substantially asdescribed.

3. The process of slakin the free lime carried by calcium cyanami whichconsists- 1n IXllXlIlg Wlth the same sufiicient sodlum,

nitrate to prevent any substantial loss of nitrogen when said lime isslaked, and .m

adding sufiicientwater to slake said 'liine,'

I aflix my signaof two witnesses. SAMU EL 'PEACOCK.

In testimony whereof, ture, in presence Witnesses:

WEAVER H RRIS, STANLEY HANNA.

